Change search
ReferencesLink to record
Permanent link

Direct link
Comparison of the Composition of Chemical Elements in the Liver of Ringed Seal (Phoca hispida) from three different populations
Norwegian University of Science and Technology, Faculty of Natural Sciences and Technology, Department of Biology.
2012 (English)MasteroppgaveStudent thesis
Abstract [en]

The ringed seal (Phoca hispida) is a circumpolar Arctic species, with several subspecies and –populations. One subspecies, Phoca hispida botnica, is found in the Baltic Sea. Large ecological differences between these regions may cause variations of trophic positioning and chemical composition in tissues among the inhabiting ringed seal populations. The Baltic Sea is one of the worlds’ most polluted seas, and the metal pollution in this area may be problematic for Baltic ringed seals. Liver samples from juvenile ringed seals (1-3 years) from three distinct populations, in northwest Greenland, East Greenland and the Baltic Sea were collected during 2008-09. Concentrations of 42 chemical elements, including As, Cd, Hg, Pb and Se, were determined using HR-ICP-MS. Stable isotope analysis (IRMS) of δ13C and δ15N were conducted in order to reveal population differences in feeding preferences (pelagic versus benthic species) and trophic positioning, respectively. Significant differences for δ13C and δ15N were found between all three populations, and the Greenland populations showed benthic preferences and higher trophic positioning relative to the Baltic Sea. The chemical element analysis revealed spatial differences between the Baltic Sea population and either one or both of the Greenland populations for several elements. However, none of the elements of concern in the Baltic Sea were present at significantly higher concentrations in the Baltic Sea population compared to the two Greenland populations. The lower trophic positioning and preferred pelagic foraging of Baltic ringed seals contribute to protect them from impacts of their polluted habitat.

Place, publisher, year, edition, pages
Institutt for biologi , 2012. , 61 p.
Keyword [no]
ntnudaim:6870, MSENVITOX Environmental Toxicology and Chemistry, Environmental Toxicology
URN: urn:nbn:no:ntnu:diva-19689Local ID: ntnudaim:6870OAI: diva2:577078
Available from: 2012-12-14 Created: 2012-12-14

Open Access in DiVA

fulltext(1004 kB)265 downloads
File information
File name FULLTEXT01.pdfFile size 1004 kBChecksum SHA-512
Type fulltextMimetype application/pdf
cover(194 kB)33 downloads
File information
File name COVER01.pdfFile size 194 kBChecksum SHA-512
Type coverMimetype application/pdf

By organisation
Department of Biology

Search outside of DiVA

GoogleGoogle Scholar
Total: 265 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 44 hits
ReferencesLink to record
Permanent link

Direct link